DF19.0 Win10
WebApp Check - All results are green.
The application is a simple use of cWebFileUploadForm as shown below.

The application runs on another Win10 machine just fine.

On this problem machine we get
HTTP error '500 Internal Server Error' while uploading file. Error 999
The "click here to find out more about this error" takes you to
https://www.iis.net/learn/applicatio...is-7-and-iis-8

I am not sure what to check next.
Any thoughts would be appreciated
Thanks

Code:
Object oUpload1 is a cWebFileUploadForm
    Set piColumnSpan to 0
    Set psLabel to "File to Upload:"
   Function OnFileUpload String sFileName Integer iBytes String sMime Returns String
        String sPath
        Get psDataPath of (phoWorkspace(ghoApplication)) to sPath
        Move (sPath + "\Uploads\" + sFileName)     to sPath
        Function_Return sPath
   End_Function
End_Object